Carrier 38AH044-084 specifications Adjust Refrigerant Charge

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NOTE: Use only Carrier approved compressor oil. Ap-

proved sources are: Petroleum Specialties Inc. (Cryol 150A), Texaco, Inc. (Capella WF-32-150), and Witco Chemical Co. (Suniso 3GS). Do not reuse oil that has been drained out, or oil that has been exposed to atmosphere.

REMOVE OIL Ð Pump down compressor to 2 psig (14 kPag). Loosen the 1¤4-in. (6.4-mm) pipe plug at the com- pressor base and allow the oil to seep out past the threads of the plug.

NOTE: The crankcase will be slightly pressurized. Do not remove the plug, or the entire oil charge will be lost.

Small amounts of oil can be removed through the oil pump discharge connection while the compressor is running.

Preliminary Charge Ð Refer to GTAC II (General Train- ing Air Conditioning), Module 5, Charging, Recovery, Recycling, and Reclamation for charging procedures. Using the liquid charging method and charging by weight proce- dure, charge each circuit with the amount of R-22 listed in Table 3A, 3B, 4A, or 4B.

Never charge liquid into the low-pressure side of sys- tem. Do not overcharge. During charging or removal of refrigerant, be sure indoor-fan system is operating.

Start Unit Ð The ®eld disconnect is closed, the fan cir- cuit breaker is closed, and the space thermostats are set above ambient so that there is no demand for cooling. Only the crankcase heaters are energized.

Close the compressor circuit breakers and then reset both space thermostats below ambient so that a call for stage one cooling is ensured. Lead refrigeration circuit ther- mostat TC1 must be set to call for cooling at a lower tem- perature than lag refrigeration circuit thermostat TC2. See Table 16 for lead/lag circuits on all units. Now set TC2 for cooling.

NOTE: Do not use circuit breakers to start and stop the com- pressor except in an emergency.

38AH044-084 DUAL-CIRCUIT UNITS Ð Start-up of lead compressor A1 (Table 16) will be delayed from 12 seconds to 51¤2 minutes from the time the call for cooling is initiated by TC1. After the lead compressor starts, close the TC2 ther- mostat to start lag circuit compressor B1. Compressor B1 will start a minimum of 60 seconds after thermostat TC2 is closed.

38AH044-084 OPTIONAL SINGLE CIRCUIT UNITS Ð Start-up of lead compressor A1 (Table 16) is delayed from 12 seconds to 51¤2 minutes from the time the call for cooling is initiated by TC1. Closure of TC2 will actuate LLS-A2. Lag compressor A2 is controlled by D-D2 timer contacts and capacity control pressure switches (CCPSs) which monitor compressor suction pressure. The lag compressor starts ap- proximately 21¤2 minutes after the lead compressor starts if the suction pressure is above the CCPS set point.

38AH094,104 UNITS Ð Start-up of lead circuit A, compressor A1 (Table 16) is delayed from 12 seconds to 51¤2 minutes from the time the call for cooling is initiated. After lead circuit A, compressor A1 starts, close refrig- eration circuit thermostat TC2 to start lag circuit B, lead

compressor B1. Start-up of compressor B1 is delayed from 12 seconds to 51¤2 minutes. (Circuit B of unit 38AH094 has only one compressor.)

Each circuit's lead compressor start-up is controlled by the unit control timer. The circuit's lag compressor start-up is controlled by the D-D2 timer contacts and capacity control pressure switches (CCPSs) which monitor compres- sor suction pressure. The circuit's lag compressor will start approximately 21¤2 minutes after a call for cooling if com- pressor pressure is above CCPS set point.

38AH124,134 UNITS Ð Start-up of the lead circuit (Module 124A or 134A) lead compressor A1 (Table 16) is delayed from 12 seconds to 51¤2 minutes from the time the call for cooling is initiated by TC1. Lag compressor A2 is controlled by D-D2 timer contacts and capacity control pres- sure switches (CCPSs) which monitor compressor suction pressure. The lag compressor starts approximately 21¤2 min- utes after the lead compressor starts if the suction pressure is above the CCPS set point.

After the lead circuit (Module 124A or 134A) lead com- pressor A1 (Table 16) starts, close the TC2 thermostat to start the lag circuit (Module 124B or 134B) lead compressor (A1). Lag circuit compressor A1 start-up is delayed from 12 sec- onds to 51¤2 minutes from the time the call for cooling is initiated by TC2. Lag compressor A2 is controlled by D-D2 timer contacts and CCPSs which monitor compressor suc- tion pressure. Lag compressor A2 starts approximately 21¤2 minutes after lead compressor A1 starts if the suction pres- sure is above the CCPS set point.

Adjust Refrigerant Charge

Never charge liquid into the low-pressure side of sys- tem. Do not overcharge. During charging or removal of refrigerant, be sure indoor-fan system is operating.

With all fans operating, and all compressors on the cir- cuit being serviced operating at full capacity, adjust the refrigerant charge in accordance with the unit charging charts located on the inside of the control box doors and in Fig. 30-43. Charge vapor into compressor low-side service port located above oil pump crankshaft housing. Measure pressure at the liquid line service valve, making sure a Schrader depressor is used if required. Also, measure liquid line tem- perature as close to the liquid service valve as possible. Add charge until the pressure and temperature conditions of the charging chart curve are met. If liquid pressure and tempera- ture point fall above curve, add charge. If liquid pressure and temperature point fall below curve, reduce the charge until the conditions match the curve.

If the sight glass at location A (Fig. 11 and 12) is cloudy, check refrigerant charge again. Ensure all fans and com- pressors on the circuit being serviced are operating. Also ensure maximum allowable liquid lift has not been exceeded.

If the sight glass at location A is clear and the sight glass at location B is cloudy, a restriction exists in the line between the 2 sight glasses. Check for a plugged ®lter drier or partially open solenoid valve. Replace or repair, as needed.

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Contents Installation, Start-Up Service Instructions Rigging Center of Gravity Ð in. mm UnitModule Unit Total Operational Corner Weight WeightCheck Compressor Mounting Dimensions Ð Units 38AH044,054,064 Dimensions Ð Units 38AH074,084 Chart 1, Field Power Supply Connections Dimensions Ð Unit 38AH094Dimensions Ð Unit 38AH104 Dimensions Ð Unit 38AH124 Dimensions Ð Unit 38AH134 Ð Units 38AH044-084 Physical Data Ð 50/60 Hz SI Ð Units 38AH044-084 Physical Data Ð 50/60 Hz EnglishÐ Units 38AH094-134 Physical Data Ð 50/60 Hz SI Ð Units 38AH094-134 Physical Data Ð 50/60 Hz EnglishControl BOX Sheet Metal Cover Panel Removed Ð Typical Module with Cover Panels Removed Make Refrigerant Piping Connections Liquid LiftUnit Maximum Liquid Lift STR Ð Street Pipe D Diameter UnitDual Circuit Single Circuit 38AH 044 Total Linear Length of Interconnecting Pipe Ð FT M Unit 15¤8 21¤8 124B,134A 074 Total Linear Length of Interconnecting Pipe Ð FT Unit124B, 134A 074 15-20 20-50 50-7538AH 6.1 TXV Ð Thermostatic Expansion Valve TYP Ð Typical Units 38AH124 and 134 with Installed Piping Kit Fully Assembled Piping and Trim Kit Unit 38AH134 Shown Kit RailsÐ Electrical Data Ð 50/60 Hz 38AH044-084 Dual-Circuit Units Make Electrical ConnectionsOptional SINGLE-CIRCUIT Unit Compressor FLARLA CKT Model Electrical Data Ð 50/60 Hz Units 38AH094,104Unit Voltage Nameplate Supply COMPRESSOR² MCA DesignationControl Circuit Electrical Data Ð 50/60 Hz Electrical Data Ð 50/60 Hz Units 38AH124Unit 38AH Module Fan Motor Electrical DataUnit Condenser FAN 38AH Nameplate Qty Total No.* FLA Each No.* LRA EachLength Ð Insulated Wire Ð AWG Length Ð Insulated Wire Ð AWG Field Wiring, One 2-Stage Thermostat Ð Units 38AH094 Field Wiring, One 2-Stage Thermostat Ð Units 38AH124 GND Terminal Block for Field Wiring, Single ModuPanel Control, Unit 38AH094 Field Wiring, Single ModuPanel Control, Unit 38AH104 Field Wiring, Single ModuPanel Control, Units 38AH124 Control Power Install AccessoriesMain Power Connection and Control Circuit Wiring Main Power Connection Control Circuit06E Compressors, Typical Preliminary ChecksAdjust Refrigerant Charge Compressor, Lead Compressor Lag Index of Lead/Lag Circuits and Compressors044-084 094 104 124 134 38AH STD OPT Lead CircuitCharging Chart Ð Unit 38AH044 50/60 Hz Ð Dual Circuit Charging Chart Ð Unit 38AH064 50/60 Hz Ð Dual Circuit Page Page Charging Chart Ð Unit 38AH104 50/60 Hz Charging Chart Ð Unit 38AH094 50/60 HzControl by Pressure ± 10 Switch Opens 160 Switch Closes 255 Refrigerant CircuitFan Cycling Control Ð Psig kPag CUT-IN Ð Cutout Ð Pressure Switch Settings Psig kPagSwitch Cutout CUT-IN Capacity ControlLoaded Cylinders Quantity of Loaded System Unit Compressor Cylinders38AH Circuit Total Unit Quantity System CapacityControl Timer Cycle Unit Control Box Compressor Replacement Ð Perform the following Compressor OIL Required06E-250 06E-265 06E-275 06E-299 Problem Solution Compressor does not RUN Compressor Stops on HIGH-PRESSURE SwitchCompressor Cycles on LOW-PRESSURE Switch Troubleshooting Pre-Start-Up Preliminary InformationComp A1 Comp A2 Comp B1 Comp B2 Start-Up

38AH044-084 specifications

The Carrier 38AH044-084 is an innovative air conditioning unit designed to provide efficient cooling solutions for residential and light commercial applications. This model is a part of Carrier's Aqua Series and is well-regarded for its combination of performance, energy efficiency, and innovative features.

One of the standout characteristics of the Carrier 38AH044-084 is its high-efficiency rating, which often exceeds the minimum efficiency standards set by the Department of Energy. Its Seasonal Energy Efficiency Ratio (SEER) rating is commendable, indicating significant energy savings over traditional air conditioning units. This efficiency translates to lower utility bills and a reduced carbon footprint, making it an environmentally friendly option.

In terms of technology, the Carrier 38AH044-084 is equipped with a modern scroll compressor. This type of compressor is known for its durability and quiet operation, contributing to a more pleasant indoor environment. The unit also incorporates advanced refrigerant technology, often using R-410A refrigerant, which is recognized for its lower environmental impact compared to older refrigerants like R-22.

The design of the 38AH044-084 focuses on ease of installation and maintenance. The compact footprint makes it suitable for various installation scenarios, whether on rooftops or ground levels. Additionally, the unit is engineered for durability, featuring weather-resistant components that can withstand harsh environmental conditions.

Another notable feature is the advanced airflow system, which ensures even distribution of cooled air throughout the space. This technology minimizes hot spots and enhances overall comfort. Furthermore, the unit supports a range of thermostatic controls, allowing users to customize their cooling experience according to their specific needs.

The Carrier 38AH044-084 is also designed with noise reduction in mind. Its sound-dampening technology helps minimize operational noise, making it a suitable choice for residential areas where noise levels are a concern.

In summary, the Carrier 38AH044-084 offers an excellent combination of energy efficiency, advanced technology, and user-friendly features. Whether for a home or a light commercial space, this unit provides reliable cooling performance while maintaining a focus on environmental responsibility and occupant comfort. With its robust design and innovative capabilities, it's a solid choice for those seeking effective and efficient air conditioning solutions.
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